Module documentation for 0.8

It depends on direct-sqlite library which includes Sqlite C sources, so there are no system dependencies.

Changes

0.8.0.1* New typeclass to allow transaction rollback through ExceptT

0.8* Support for GHC 8

0.7.0.1* Support for monad-control 1.0

0.7.0* Bump with groundhog

0.6.0* Entity and fields descriptions are parameterized so that they can be promoted* Entity and fields descriptions are dependent on database proxy. It allows to use different types depending on a database, for example, the same type can be array[] in PostgreSQL and varchar elsewhere